I have a dark fruit cake in the cupboard that’s six years old. It was regularly rubbed with Brandy for the first four years, and stored in several layers of Glad Wrap. About 18 months ago, I covered it with a thin layer of Marzipan, then the usual white icing (fondant) stuck on with boiled apricot jam. I did my best to make sure there was no air trapped in the layers. It’s been back in the cupboard, again under several layers of Glad Wrap, since.
Anyone want to speculate on what the eating will be like at Christmas time?